JSFiddle - React, Tailwind, and code Playground

JavaScript

function weakPoint(matrix) {
  let rowStrength = matrix.map(row => row.reduce((acc, cur) => acc += cur));
  console.log(rowStrength);
  let colStrength = matrix[0].map((_, i) => matrix.reduce((acc, cur) => acc += cur[i]), matrix[0][0]); //  matrix[0][0]? Вместо 7 acc первым значением принимает первый массив
  console.log(colStrength);
}

weakPoint([
  [7, 2, 7, 2, 8],
  [2, 9, 4, 1, 7],
  [3, 8, 6, 2, 4],
  [2, 5, 2, 9, 1],
  [6, 6, 5, 4, 5]
])